An f40 file extension is related to the FORTRAN-4 compiler for PDP-10 mainframe computers. An f40 file stores FORTRAN source code.
F40 file extension - PDP-10 FORTRAN-4 compiler source
What is f40 file? How to open f40 files?
File type specification:
The f40 file extension is related to the PDP-10 Fortran-4. The f40 file contains compiler source.
The PDP-10 was a mainframe computer manufactured by Digital Equipment Corporation (DEC) from the late 1960s
Fortran is a general-purpose, procedural, imperative programming language that is especially suited to numeric computation and scientific computing.
This f40 file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.